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Messages - Tweakie.CNC

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6581
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: July 19, 2010, 06:26:44 AM »
This little bike is very different from the others – It is edible, which means that I get to eat anything I make (after it has been photographed).  ;)

Inspired by the Candy Fab project http://candyfab.org/ this 15mm long bike has not been cut-out, it has been laser printed using sugar.
OK this is just my first attempt and it is perhaps not that brilliant, but it is early days yet and many obstacles have still to be overcome - not least, getting sufficient air pressure to keep the vaporized material off my focus lens without blowing everything else away. There are, of course, many other fusible materials with a much smaller grain structure than cane sugar which may well produce much better results so there is a lot of room for experimentation here. (I have just discovered how fine the particles of laser toner are, having just blown a teaspoon full all over my machine table).   :(

If I can get a grip on this and overcome the obstacles then 3D printing here we come (perhaps).  ;D

Tweakie.

6582
General Mach Discussion / Re: Unipolar stepper motor with ULN2003?
« on: July 18, 2010, 04:54:27 AM »
Correction to above:-

(Some basic maths shows that if you are using a 12 volt power supply you need to put a 24 ohm 6 watt resistor in series with each of the pins 13 to 16).  ;)

Tweakie.

6583
General Mach Discussion / Re: Rough Motion With Mach3
« on: July 17, 2010, 08:31:52 AM »
Mike,

Have you checked the Win XP optimization doc at the bottom of this page - may be something there that you haven't tried already.

http://www.machsupport.com/downloads.php

Tweakie.

6584
General Mach Discussion / Re: Unipolar stepper motor with ULN2003?
« on: July 17, 2010, 07:24:26 AM »
I thought I had already given you the solution :- "You need to current limit the supply to each coil to ensure it doesn't exceed 500mA per driver (series resistors in line with pins 13 - 16). Also you may need to heatsink the ULN2003".

(Some basic maths shows that if you are using a 24 volt power supply you need to put a 24 ohm 6 watt resistor in series with each of the pins 13 to 16).  ;)

Tweakie.

6585
There are people here George - I am the 21st person to look at this who doesn't know the answer.  :( :(

Tweakie.

6586
General Mach Discussion / Re: Geckp 540 and Solid State Relay
« on: July 17, 2010, 04:53:20 AM »
David,

Don't know if this is any help but this is the typical SSR configuration.

Tweakie.

6587
FAQs / Re: steppers novato
« on: July 16, 2010, 01:09:30 PM »
Some additional thoughts here.

If your motors get hot during operation (too hot to comfortably keep your hand on) then you will need to fit series resistors to limit the current through the coils but as said earlier I doubt they will be necessary.

Tweakie.

6588
FAQs / Re: steppers novato
« on: July 16, 2010, 01:05:09 PM »
OK if you are going to run your steppers at 5 Volts then no series resistors are necessary.
The power supply needs to be 5 Volt at 14 Amps (15 Amps is the standard rating).

Tweakie.

6589
FAQs / Re: steppers novato
« on: July 16, 2010, 12:24:49 PM »
According to your diagram - you will only have two coils per motor energized at any one time. As each coil is rated at 3.5 Amps max then for 2 stepper motors the power supply needs to be able to supply (4 x 3.5) 14 Amps. (The most common stepper voltage used for small machines seems to be 24 Volts). The formula for calculating the series resistance is given in the driver spec.

Also, as it says in the driver spec, at this current the board is going to get hot so forced air cooling may be necessary.

Tweakie.

6590
Tangent Corner / Electrical Regulations Safety Checks.
« on: July 16, 2010, 07:27:11 AM »
Under our new safety regulations the electrical inspection checks have to be done every 6 months now.
I had to do this one myself because our useless electrician refused to issue a safety certificate because he said it was a death trap.

Tweakie.

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